A principle involving the variation of the metric tensor in a stationary space-time of general relativity
Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 139-145. 
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     author = {Battaia, Luciano},
     title = {A principle involving the variation of the metric tensor in a stationary space-time of general relativity},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {139--145},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {56},
     year = {1976},
     mrnumber = {479288},
     zbl = {0381.53021},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1976__56__139_0/}
}
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Battaia, Luciano. A principle involving the variation of the metric tensor in a stationary space-time of general relativity. Rendiconti del Seminario Matematico della Università di Padova, Tome 56 (1976), pp. 139-145. http://archive.numdam.org/item/RSMUP_1976__56__139_0/

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[2] A. Bressan, Relativistic theories of materials, Being printed by Springer, Berlin. | MR | Zbl

[3] H.G. Schöpf, Allgemeinrelativistische Prinzipien der Kontinuumsmechanik, Ann. Physik, 12 (1964), p. 377. | MR | Zbl

[4] A.H. Taub, A general variational principle for perfect fluid, Phys. Rev., 94 (1954), p. 1468. | MR